12S 



in the Stonesfield-slate ought to be ascribed to this extinct family 

 of reptiles ; and Dr. Buckland entertains the same opinion respect- 

 ing certain bones found also in the lias, at Lyme-Regis, and sup- 

 posed to have been those of birds. The Pterodactyles consequently, 

 would appear to have been in existence throughout the entire in- 

 terval from the deposition of the lias to that of the chalk. 



The author has connected with his Paper on the Pterodactyle, 

 some observations on a substance analogous to album-graecum, pro- 

 duced apparently by the Saurian animals, whose remains are de- 

 posited in the lias ; and on a dark colouring matter possessing the 

 properties of Sepia and Indian ink, afforded by a fossil which exhibits 

 a structure like that of the cuttle-fish. He is still engaged in the 

 inquiries connected with these subjects ; and has already obtained 

 some very curious and unexpected results. 



Mr. R. C. Taylor, one of our Fellows, has prepared a valuable 

 list of the fossils hitherto discovered in the British strata *, drawn 

 principally from the works and authority of Mr. Sowerby, to whose 

 indefatigable exertions in extending our acquaintance with the 

 fossils of England Geology is under most essential obligation. The 

 List details the genera in each of its divisions alphabetically; giving 

 for each genus the number of the species most characteristic or 

 abundant in each formation, with the principal localities where they 

 occur. It is not susceptible of abridgement : but some of the results 

 which can be expressed by numbers, have been thrown by the 

 author into Tables, of which the following is a summary :— 



13 <! 



JS 

 CO 



r ("Total number of Species known. 



Recent. J (from Wood's Index^ Testaceo- 



logicus) 

 f Total number of Genera 



Fossil, j 



^_Total number of Species 



13 



a. 

 es 



s- 

 es 



r Carboniferous Order, of Cony-") 

 J beare. (Species) J 



nt <| Carboniferous beds, to Lias. (Species) 

 Total of Species/ 



Strata. 



• Ancient strata, to Lias inclusive. 



f Inferior Oolite to Chalk inclusive. \ 



More j (Species) * 



recent 4 Strata above the Chalk (Species) . . 



Strata I " 



' From the Lias to the most recent 



beds. Total of Species 



I 



1*1 



1961 

 58 



401 



36 



106 

 t>.-)9 



565 



874 



67 



375 

 516 



141 



51 83 



58 



12 



230 



134 

 139 



147 



„ 1 



147 



as 



2893 

 135 



1265 



140 

 97 



237 



620 

 408 



1028 



* Now published in Loudon's Magazine of Natural History, for March 

 1829, Vol. II. p. 26, &c. 



